Add support page for new nederlandse spoorwegen sensor (#3773)

* Add support page for new nederlandse spoorwegen sensor

* Rename departures to routes.

source/_components/sensor.nederlandse_spoorwegen.markdown

@@ -0,0 +1,51 @@
+---
+layout: page
+title: "Nederlandse Spoorwegen"
+description: "Instructions how to integrate timetable data for travelling by train in the Netherlands within Home Assistant."
+date: 2017-10-25 13:35
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: nederlandse_spoorwegen.png
+ha_category: Transport
+ha_iot_class: "Cloud Polling"
+ha_release: "0.57"
+---
+
+
+This sensor will provide you with time table information of the [Nederlandse Spoorwegen](https://www.ns.nl/) train service in the Netherlands.
+
+You must create an application [here](https://www.ns.nl/ews-aanvraagformulier/) to obtain a `password`.
+
+Add the data to your `configuration.yaml` file as shown in the example:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+- platform: nederlandse_spoorwegen
+    email: you@example.com
+    password: !secret ns_password
+    routes:
+      - name: Rotterdam-Amsterdam
+        from: Rtd
+        to: Asd
+      - name: Groningen-Zwolle-Maastricht
+        from: Gn
+        to: Mt
+        via: Zl
+```
+
+Configuration variables:
+
+- **email** (*Required*): The email address you used to request the API password.
+- **password** (*Required*): The API password provided by the Nederlandse Spoorwegen.
+- **routes** array (*Required*): List of travelling routes.
+  - **name** (*Required*): Name of the route.
+  - **from** (*Required*): The start station.
+  - **to** (*Required*): Direction of the travelling.
+  - **via** (*Optional*): Optional other station you wish to visit in between.
+
+The data are coming from [Nederlandse Spoorwegen](https://www.ns.nl/).
+
+Station codes must be used and can be looked up [here](https://nl.wikipedia.org/wiki/Lijst_van_spoorwegstations_in_Nederland).